To determine if 99 is a prime number or a composite number, we simply look at the factors for 99.
If the factors of 99 are only 99 and 1, then we know that 99 is a prime number. Otherwise, 99 is a composite number.
To explain better, if 99 is only divisible by 1 and 99, then it is a prime number, and if 99 is divisible by more than 99 and 1, then it is a composite number.
The factors of 99 are as follows:
1, 3, 9, 11, 33, 99
Therefore, since 99 is divisible by more than one and itself, the answer to the
question "Is 99 prime or composite?" is highlighted in blue below.
composite
Is 100 prime or composite?
OK. Now you know that 99 is a composite number. Use our logic above and see if
you can figure out if the next number on our list is prime or composite before you check your answer.
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